Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Summary of Provision for Income Taxes from Continuing Operations

The following table summarizes our provision for income taxes for the periods presented: 

	Successor								Predecessor
							September 13 Through		January 1 Through
	Year Ended December 31,						December 31,		September 12,
	2018			2017			2016		2016
Current income taxes (benefit)
Federal	$	(2,471	)	$	—		$	—	$	—
	(2,471		)	—			—		—
Deferred income taxes (benefit)
Federal	2,471			(4,943		)	—		—
State	523			—			—		—
	2,994			(4,943		)	—		—
	$	523		$	(4,943	)	$	—	$	—

Income Taxes Reconciliation

The following table reconciles the difference between the income tax expense (benefit) computed by applying the statutory tax rate to our income (loss) before income taxes and our reported income tax benefit for the periods presented: 

	Successor															Predecessor
											September 13 Through					January 1 Through
	Year Ended December 31,										December 31,					September 12,
	2018					2017					2016					2016
Computed at federal statutory rate	$	47,315		21.0	%	$	9,701		35.0	%	$	(1,854	)	35.0	%	$	369,111		35.0	%
State income taxes, net of federal income tax benefit	1,743			0.8	%	(1,383		)	(5.0	)%	197			(3.7	)%	1,989			0.2	%
Change in valuation allowance	(48,820		)	(21.7	)%	(24,353		)	(87.8	)%	1,657			(31.3	)%	(384,692		)	(36.5	)%
Effect of rate change on the valuation allowance	—			—	%	(86,612		)	(312.5	)%	—			—	%	—			—	%
Effect of rate change	—			—	%	86,612			312.5	%	—			—	%	—			—	%
Reorganization adjustments	—			—	%	10,760			38.8	%	—			—	%	13,572			1.3	%
Other, net	285			0.1	%	332			1.2	%	—			—	%	20			—	%
	$	523		0.2	%	$	(4,943	)	(17.8	)%	$	—		—	%	$	—		—	%

Summary of Principal Components of Net Deferred Income Tax Liability

The following table summarizes the principal components of our deferred income tax assets and liabilities as of the dates presented: 

	December 31,
	2018			2017
Deferred tax assets:
Net operating loss (“NOL”) carryforwards	$	163,437		$	127,821
Property and equipment	—			37,345
Pension and postretirement benefits	441			452
Share-based compensation	546			435
Fair value of derivative instruments	—			8,752
Other	8,836			7,608
	173,260			182,413
Less:  Valuation allowance	(128,650		)	(177,470		)
Total net deferred tax assets	44,610			4,943
Deferred tax liabilities:
Property and equipment	33,413			—
Fair value of derivative instruments	9,248			—
Total deferred tax liabilities	42,661			—
Net deferred tax assets	$	1,949		$	4,943